Umbrella hub



FIG. 1 is a perspective view of the umbrella hub, shown with environmental structure;

FIG. 2 is a another perspective view of the umbrella hub;

FIG. 3 is a front or rear view of the umbrella hub;

FIG. 4 is a right or left side view of the umbrella hub;

FIG. 5 is a top view of the umbrella hub; and,

FIG. 6 is a bottom view of the umbrella hub.

The broken lines shown indicate environment and portions of the umbrella hub and form no part of the claimed design. 

CLAIM The ornamental design for an umbrella hub, as shown and described. 